Four scans from Steve Rogers: Super-Soldier #3, and four from Captain America: Patriot #1.

In the penultimate issue of Steve Rogers: Super-Soldier, wherein Ed Brubaker takes the newly-returned Steve out for a spin all by his lonesome. Last issue saw Steve get his powers neutralized by Machinesmith, who is figuring out how to reproduce the serum so that he can mass-market it (I've never bought the idea that the serum was some kind of Holy Grail, but whatever). Scrawny Steve is a bit in trouble. Eventually, Machinesmith decides he doesn't need Steve anymore and orders him killed.

The flashbacks are a followup to the start of the issue, where we saw l'il Steve constantly being beat up by poor douchebags in his neighbourhood.

Meanwhile, Marvel throws some work Karl Kessel's way with Captain America; Patriot, a four-issue miniseries about the original Patriot (Jeff Mace), who became the third Captain America. The first issue is basically the origin story of the Patriot, as we see him put on the costume after seeing one of Steve's exploits as a reporter. At the end of the issue, we find Jeff being interrogated in 1946 by people wondering what he was doing in Boston at that point in time. He says he got a tip that something bad was going down there.

But since that isn't an option, instead he puts on the costume and completes the mission as Captain America, saving the local politician running for Congress. One of his two interrogators thinks it's suspicious that he was the only person around when Cap II was killed.

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These guys have all taken experimental versions of the serum that Machinesmith has replicated; it's a prototype, and is somewhat defective (one of the guards in an earlier issue outright died of an embolism in the middle of a fight).